I started w/ a 4" niger. He was calm and well behaved. 3-4 months later, I added a 4-5" sargassum. A little aggression initially but nothing severe. 2-3 months later, I found an "African" niger. He had a lot of red in his body and was prob. 6-7". Finally, I added a blue throat. After about 6 months with no apparent problems, the blue throat croaked. Everyone had been eating but the larger niger did have a habit of chasing the others occ. I removed the smaller niger and traded him. I tried many times to catch the large niger but as soon as he saw the net, he would scram. I added a pair of blue throats and they seemed to do fine for about 3 weeks. Female died, then the male. The final straw was my beautiful sargessum croaked. I caught the niger one eve. He parked in a crevice at night and w/ the lights off, I simply grabbed him with heavy pick-ups/tweezers and pulled him out. I never saw the niger biting or any signs of damage on the other triggers but I dont know what else to blame their demise on. I'm now triggerless and miss them. I may try again one day but no nigers for me.